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(No Model.)

' N. W. PRATT! MANIFOLD FOR WATER TUBE BOILERS. No. 368,614. PatentedAug. 23; 1887.

WITNESSES.

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A TTORNEY.

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' To all whom, it may concern.-

UNITED STATES PATENT NAT. W. PRATT, OF BROOKLYN, NEW YORK.

MANIFOLD FOR WATER-TUBE BOILERS.

SPECIFICATION forming part of Letters Patent No. 368,614, dated August23, 1887.

Serial No. 229,577. (No model.)

Be it known that I, NAT. W. PRATT, a citizen of the United States,residing at Brooklyn, county of Kings, and State of New York, haveinvented certain new and useful Improvements in Manifolds for Water-TubeBoilers, of which the following is a specification.

This invention relates to the construction of manifold tube-headers foruse in connecting together series of water -tubes of sectionalsteam-boilers; and the said invention consists in certain novel featuresof said construction as applied either to corrugated or other shapedheaders, whereby the same are manufactured from wrought-metal plates.

In order to enable others skilled in the art to which my inventionappertains to understand and use the same, I will proceed to describe indetail the manner of its construction, having reference to theaccompanying drawings, in which like letters of reference indicatecorresponding parts.

Figure 1 is a front elevation of a completed header; Fig. 2, an end viewof the same; Fig. 3, a cross-section of the same on the line w m, Fig.1; Fig. 4, a front elevation, partly in section, of the inventionembodiedin a modified form of header; Fig. 5, a side View of Fig. 4;Fig. 6, a front elevation of a second modification of form; Fig. 7, aside view of Fig. 6, Fig. 8, a front elevation of a third modificationof form; Fig. 9, a side view thereof; and Fig. 10, a cross-section,corresponding with Fig. 3, showing a modified detail of construction.

The open box A, Figs. 1, 2, and 3, the sides of which compose theexterior flange, a, Fig. 1, is pressed or stamped from a single piece ofmetal into the corrugated trough-like form, the ends a being formed fromthe same piece. At the same operation, or at a subsequent operation, theback of the box A is perforated with circular holes at for the receptionof the water-tubes, to be fixed therein by the expanding process, orotherwise. The ends a are also perforated with circular openings 0, forthe reception of tube-connections.

A separate plate, B, formed in a similar manner, having the flange .b,Fig. l, is per-' forated with oblong openings 0, having asuitable shapefor the introduction of hand-hole plates opposite the tube-perforations.The

plate B, flanged at b to fit the interior of the flanges a. a, or sidesof the box, is welded or riveted in the position more clearly shown byFig. 3, the flange b projecting outward pref-- erably. The plate B mayalso be made without flanges, and of a sufficient thickness, as in Fig.10, to be welded in place by its edges, presenting a flush exteriorsurface of the manifold.

The manifolds shown by Figs. 4 to 9, inclusive, are produced in acorresponding manner to that described with relation to Figs. 1, 2, and3, and the feature of Fig. 10 is likewise applicable. The dotted linesindicate the relative position of adjacent duplicate manifolds, whichare connected in series by means of nipples f, fixed into theperforations c.

What I claim as my invention, and desire to secure by Letters Patent,is-- 1. The method of making wrought-metal manifolds for water-tubeboilers, consisting in pressing or stamping an open box from sheet metaland then closing the remaining side by welding or riveting a platetherein, substantially as described.

2. The method of making wrought-metal manifolds for water-tube boilers,consisting in first pressing or stamping an open box from sheet metal,and either at the same time or a subsequent operation perforating thesame for the reception of tubes, and then closing the remaining side byriveting or welding a plate therein, substantially as described.

3. The method of making wrought-metal manifolds for water-tube boilers,consisting in pressing or stamping an open box from sheet metal, andeither at the same time or a subsequent operation perforating the same,and then welding or riveting a perforated plate therein, substantiallyas described.

4. Awrought-metal manifold for water-tube boilers in box form, havingthree or more of its sides made from one piece of metal and one sidefixed therein by weldingor riveting, substantially as described.

NAT. W. PRATT.

Witnesses:

CHAS. W. Fomsns, AUG. CBEVELING.

